100 Python questions, one for each day of the challenge:

1 Print the length of the string "Hello, world!".

2 Print the sum of the numbers 1 and 2.

3 Print the Fibonacci sequence up to the 10th term.

4 Check whether a number is prime or not.

5 Find the factorial of a number.

6 Print a multiplication table for a given number.

7 Check whether a string is a palindrome or not.

8 Convert a temperature from Celsius to Fahrenheit.

9 Convert a temperature from Fahrenheit to Celsius.

10 Check whether a year is a leap year or not.

11 Write a function to check whether a string is a pangram or not.

12 Write a function to find the longest common substring of two strings.

13 Write a function to reverse a string.

14 Write a function to check whether a number is a perfect square or not.

15 Write a function to find the greatest common divisor (GCD) of two numbers.

16 Write a function to find the least common multiple (LCM) of two numbers.

17 Write a function to check whether a number is an Armstrong number or not.

18 Write a function to find the kth permutation of a given set of numbers.

19 Write a function to find the next lexicographical permutation of a given string.

20 Write a function to check whether a graph is bipartite or not.

21 Write a function to find the shortest path between two nodes in a graph.

22 Write a function to find the minimum spanning tree of a graph.

23 Write a function to find the diameter of a tree.

24 Write a function to check whether a tree is a binary search tree or not.

25 Write a function to insert a node into a binary search tree.

26 Write a function to delete a node from a binary search tree.

27 Write a function to search for a node in a binary search tree.

28 Write a function to find the inorder successor of a node in a binary search tree.

29 Write a function to find the preorder successor of a node in a binary search tree.

30 Write a function to find the postorder successor of a node in a binary search tree.

31 Write a function to find the level order traversal of a binary tree.

32 Write a function to find the height of a binary tree.

33 Write a function to check whether a binary tree is balanced or not.

34 Write a function to convert an infix expression to a postfix expression.

35 Write a function to convert a postfix expression to an infix expression.

36 Write a function to evaluate a postfix expression.

37 Write a function to find the maximum depth of a nested list.

38 Write a function to flatten a nested list.

39 Write a function to check whether a linked list is a palindrome or not.

40 Write a function to reverse a linked list.

41 Write a function to insert a node into a linked list.

42 Write a function to delete a node from a linked list.

43 Write a function to search for a node in a linked list.

44 Write a function to find the middle node in a linked list.

45 Write a function to find the nth node from the end of a linked list.

46 Write a function to merge two sorted linked lists.

47 Write a function to find the intersection point of two linked lists.

48 Write a function to find the union of two linked lists.

49 Write a function to check whether a linked list is circular or not.

50 Write a function to find the length of a linked list.

51 Write a function to find the median of a list of numbers.

52 Write a function to find the mode of a list of numbers.

53 Write a function to find the range of a list of numbers.

54 Write a function to find the variance of a list of numbers.

55 Write a function to find the standard deviation of a list of numbers.

56 Write a function to find the covariance of two lists of numbers.

57 Write a function to find the correlation coefficient of two lists of numbers.

58 Write a function to fit a linear regression model to a dataset.

59 Write a function to fit a logistic regression model to a dataset.

60 Write a function to perform k-means clustering on a dataset.

61 Write a function to implement the Naive Bayes classification algorithm.

62 Write a function to implement the Support Vector Machine (SVM) classification algorithm.

63 Write a function to implement the Random Forest classification algorithm.

64 Write a function to implement the K-Nearest Neighbors (KNN) classification algorithm.

65 Write a function to implement the Decision Tree classification algorithm.

66 Write a function to implement the Naive Bayes classification algorithm for spam filtering.

67 Write a function to implement the Support Vector Machine (SVM) classification algorithm for sentiment analysis.

68 Write a function to implement the Random Forest classification algorithm for image recognition.

69 Write a function to implement the K-Nearest Neighbors (KNN) classification algorithm for handwriting recognition.

70 Write a function to implement the Decision Tree classification algorithm for medical diagnosis.

71 Define a class to represent a bank account.

72 Define a class to represent a student.

73 Define a class to represent a book.

74 Define a class to represent an employee.

75 Define a class to represent a car.

76 Implement inheritance in a class hierarchy for animals.

77 Implement polymorphism in a class hierarchy for shapes.

78 Implement encapsulation in a class to represent a bank account.

79 Implement abstraction in a class to represent a

80 Implement a stack data structure using Python.

81 Implement a queue data structure using Python.

82 Implement a linked list data structure using

83 Implement a double-linked list data structure using Python.

84 Implement a circular linked list data structure using Python.

85 Implement a binary search tree data structure using Python.

86 Implement an AVL tree data structure using Python.

87 Implement a red-black tree data structure using Python.

88 Implement a hash table data structure using Python.

89 Implement a heap data structure using Python.

90 Implement a graph data structure using Python.

91 Implement a directed graph data structure using Python.

92 Implement a weighted graph data structure using Python.

93 Implement a breadth-first search algorithm for traversing a graph.

94 Implement a depth-first search algorithm for traversing a graph.

95 Implement Dijkstra's algorithm for finding the shortest path in a weighted graph.

96 Implement Kruskal's algorithm for finding the minimum spanning tree of a weighted graph.

97 Implement Prim's algorithm for finding the minimum spanning tree of a weighted graph.

98 Implement a sorting algorithm, such as bubble sort, insertion sort, merge sort, or quick sort.

99 Implement a searching algorithm, such as binary search or linear search.

100 Write a Python program to solve a real-world problem, such as building a simple web scraper, a text summarizer, or a financial data analyzer.